President Barack Obama‘s decision over who will lead the National Economic Council after Larry Summers leaves is one of his most important moves in the coming weeks. A senior U.S. official said on Tuesday that Obama had met with Yale University President Richard Levin to discuss a job in the administration.

A spokesman for Yale University declined to comment. Along with Levin, investment banker Roger Altman and U.S. Treasury official Gene Sperling are also being looked at as potential successors, but no decision has been made. Altman also has met with the president. Spokesman Robert Gibbs said on Monday it might not be possible to name a replacement for Summers by the end of the year because of a busy legislative calendar. Summers, who is stepping down this month as director of the NEC, is returning to Harvard University.